Python3 _ Stupid Methodology Python_ Diary _DAY4

Day4

• Exercise 19: Functions and variables

1 defcheese_and_crackers (Cheese_count, boxes_of_crackers):2     Print("You have %d cheeses!"%cheese_count)3     Print("You have %d boxes of crackers!"%boxes_of_crackers)4     Print("Man that's enough for a party!")5     Print("Get a blanket.\n")6 7 Print("We can just give the function numbers directly:")8Cheese_and_crackers (20,30)9 Ten Print("Or,we can use variables from our script:") OneAmount_of_cheese = 10 AAmount_of_crackers = 50 -  - cheese_and_crackers (Amount_of_cheese, amount_of_crackers) the  - Print("We can even do math inside too:") -Cheese_and_crackers (10+20, 5+6) -  + Print("and we can combine the variables and math:") -Cheese_and_crackers (Amount_of_cheese + 100, +Amount_of_crackers + 1000)

Results:

We can just give the function numbers directly:
You have a cheeses!
You have a boxes of crackers!
Man that's enough for a party!
Get a blanket.

Or,we can use variables from our script:
You have ten cheeses!
You have boxes of crackers!
Man that's enough for a party!
Get a blanket.

We can even do math inside too:
You have a cheeses!
You have one boxes of crackers!
Man that's enough for a party!
Get a blanket.

And we can combine the variables and math:
You have cheeses!
You have 1050 boxes of crackers!
Man that's enough for a party!
Get a blanket.

Make a function of yourself:

1 def Pingfang (x): 2     return x*x34print(Pingfang (5))56 y =pingfang (6)7print(y)

25
36

• Exercise 20: Functions and files

1  fromSysImportargv2 3 #script name, parameter one (imported file)4Script, Input_file =argv5 6 defPrint_all (f):#define a new function: Print out all the files7     Print(F.read ())8 9 defRewind (f):#define a new function: Move the file pointer to the beginningTen f.seek (0) One  A defPrint_a_line (Line_Count, F):#define new function: Print (line number, contents of this line) -     Print(Line_Count, F.readline ()) -  theCurrent_file = open (input_file)#define variables to open the imported file as the current file -  - Print("First let ' s print the whole file:\n") -  + Print_all (current_file) -  + Print("Now let's rewind, kinds of like a tape.") A Rewind (Current_file) at  - Print("Let ' s print three lines:") -  -Current_file = 1 - print_a_line (Current_file, Current_file) -  inCurrent_file = current_file + 1 - print_a_line (Current_file, Current_file) to  +Current_file = current_file + 1 -Print_a_line (Current_file, Current_file)

• Exercise 21: Functions can return something

1 defAdd (A, b):2     Print("ADDING%d +%d"%(A, b))3     returnA +b4 5 defSubtract (A, b):6     Print("subtracting%d-%d"%(A, b))7     returnAb8 9 defmultipy (A, b):Ten     Print("multiplaying%d *%d"%(A, b)) One     returnAb A  - defDivide (A, b): -     Print("dividing%d/%d"%(A, b)) the     returnAb -  - Print("Let's do some math with just functions!") -  +Age = Add (30, 5) -Height = Subtract (78,4) +Weight = multipy (90,2) AIQ = Divide (100,2) at  - Print("Age :%d, Height:%d, Weight:%d, IQ:%d"%(age, height, weight, IQ)) -  - #A Puzzle for the extra credits, type it in anyway. - Print("Here is a puzzle.") -  inwhat = Add (age, subtract (height, multipy (weight, divide (iq,2)))) -  to Print("That becomes:\n", What,"\ncan Do it by hand?")

Let's do some math with just functions!
ADDING 30 + 5
Subtracting 78-4
Multiplaying 90 * 2
Dividing 100/2
Age:35, height:74, weight:180, iq:50
Here is a puzzle.
Dividing 50/2
Multiplaying 180 * 25
Subtracting 74-4500
ADDING 35 +-4426
That becomes:
-4391.0
Can do it by hand?

Puzzle solving

1 def Jia (a,b,c,d,e): 2     Print (" the answer to the puzzle is all right. \ n%d + (%d-%d *%d/%d)" % (a,b,c,d,e)) 3     return A + (b-c*d/e)45 This=jia (35,74,180,50,2)6 Print (This) 7 Print (This==what)

The answer to the puzzle is all right
35 + (74-180 * 50/2)
-4391.0
True

Python3 _ Stupid Methodology Python_ Diary _DAY4